Operational Test of the Wing Tip Brake and the Pressure Off Brake

TASK 27-51-00-710-001-A
Operational Test of the Wing Tip Brake and the Pressure Off Brake

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

FIN: 33CV
FIN: 34CV

1. Reason for the Job
Refer to the MPD TASK: 275100-01
OPERATIONAL CHECK OF WTB/POB

NOTE: If you do this task together with MPD-TASK 275100-03, do MPD-TASK 275100-03 after this operational test.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-38-00-710-001-A	Operational Test of the Battery Charge Limiter (BCL), (with the CFDS)
TASK 24-38-00-710-001-A-01	Operational Test of the Battery Charge Limiter (BCL), (without the CFDS)
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 27-50-00-869-006-A	Reset of the Wing Tip Brake (WTB) of the Flap System on the Ground
TASK 27-51-00-740-002-A	BITE Test of the Slat and Flap Control Computers (Flap System)
TASK 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-863-002-A	Pressurize the Yellow Hydraulic System from the Green Hydraulic System through the PTU with the Ground Service Cart
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 31-32-00-860-006-A	Procedure to Get Access to the SYSTEM REPORT/TEST F/CTL Page
TASK 71-00-00-710-003-A	Engine Automatic Start
TASK 71-00-00-710-003-B	Engine Automatic Start
TASK 71-00-00-710-004-A	Engine Manual Start
TASK 71-00-00-710-004-B	Engine Manual Start
TASK 71-00-00-710-018-A	Discontinued Start, Restart and Shutdown Procedures
TASK 71-00-00-710-028-A	Engine Shutdown
TASK 71-00-00-710-028-B	Engine Shutdown
TASK 71-00-00-710-043-A	Normal Engine Automatic-Start Procedure
TASK 71-00-00-710-047-A	Normal Engine Manual-Start Procedure
TASK 71-00-00-860-822-A	Start the Engine (Normal Manual Start)
TASK 71-00-00-860-823-A	Start the Engine (Normal Automatic Start)
TASK 71-00-00-860-824-A	Discontinue Engine Start

3. Job Set-up
Subtask 27-51-00-941-050-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put the WARNING NOTICE(S) in position to tell persons that the flap and slat systems are in operation.

Subtask 27-51-00-861-058-A

B. Energize the aircraft electrical circuits
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the aircraft batteries are fully charged (Ref. AMM TASK 24-38-00-710-001).

Subtask 27-51-00-865-065-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B06
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B02
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B01
** ON A/C ALL
121VU	FLIGHT CONTROLS/WTB/FLP/SYS2	12CV	P20
121VU	FLIGHT CONTROLS/FLP/CTL AND/MONG/SYS2	8CV	Q21
121VU	FLIGHT CONTROLS/SLT/CTL/SYS2	7CV	R21
122VU	FLIGHT CONTROLS/WTB/FLP/SYS1	10CV	S07

Subtask 27-51-00-865-064-A

D. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/26VAC	14CC1	H09
** ON A/C ALL
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

Subtask 27-51-00-860-054-A

E. Aircraft Maintenance Configuration
(1) Get access to the SYSTEM REPORT/TEST (F/CTL) page on the MCDU (Ref. AMM TASK 31-32-00-860-006).
(2) Do the BITE test of the SFCC (Flap System) to get the information of the current status of the related flap and slat system (Ref. AMM TASK 27-51-00-740-002):
(a) After this BITE test:
1 If the BITE test result is positive (the page shows FLAP SFCC TEST NO FAULTS), go to Para. 'F. Initial Conditions'.
2 If the BITE test result is negative (the page shows FLAP SFCC TEST PERFORMED WITH FAULTS):
Refer to the fault message which comes into view and:

do the related maintenance procedure(s) (for example: If the test shows that the Wing Tip Brakes (WTBs) are set, do the reset of the WTBs (Ref. AMM TASK 27-50-00-869-006)
or
do the related trouble shooting procedure(s) (for example: If the test shows a fault of a LRU).

(b) After the maintenance/trouble shooting procedure(s):

Do the BITE test again and make sure that the test result is positive.

Subtask 27-51-00-860-052-A ** ON A/C NOT FOR ALL

F. Initial Conditions
(1) Make sure that the CFDS is not in the SFCC MENU mode before you start the WTB/POB test.
You must go from the off-line mode (SFCC MENU mode) to the on-line mode (SFCC NORMAL mode).

NOTE: The WTB/POB test will not operate if a BITE test was completed before without going from the off-line mode to the on-line mode.
Subsequently a 'CORRUPTED RAM -RETURN ONLINE' or a 'PIN PROG FAULT' will be shown.

(a) At the MCDU, after the BITE test of the two SFCC's (Flap System), go back to the CFDS MENU page.
(2) On the overhead panel 50VU: Make sure that the HYD LEAK MEASUREMENT VALVES G/B/Y P/BSW are in the ON position (on the pushbutton switches, the OFF legends are off).
(3) Special Condition:

NOTE: If you do this WTB/POB test with engine driven pumps and you entered a FLT NBR or a F-PLAN through the MCDU before engine start, CFDS is inhibited 3 min after first engine start.

If this occurs, do the steps that follow:
(a) Open the C/Bs (for designation and location refer to Para. 3.G.):

(b) After 40 seconds, close C/Bs 2TW and 8TW.
(c) Wait for CFDS initialization.
(d) Close C/B 3WW.
(e) Do the operational test of the WTB/POB (refer to Para. 4.A.).
(f) Close C/B 2WW after the test was done successfully.
(4) It is possible to pressurize the hydraulic systems with 3 different procedures:
(a) Pressurization with the electric pumps:
1 Pressurize the Blue hydraulic system with the blue electric pump (Ref. AMM TASK 29-10-00-863-003).
2 Pressurize the Green hydraulic system from the Yellow hydraulic system through the Power Transfer Unit (PTU) with the electric pump (Ref. AMM TASK 29-23-00-863-001).
(b) Pressurization with a ground power cart:
1 Pressurize the Blue hydraulic system with the ground power cart (Ref. AMM TASK 29-10-00-863-003).
2 Pressurize the Yellow hydraulic system from the Green hydraulic system through the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-863-002).
(c) Pressurization with the engine driven pumps (EDPs):
1 Start both engines by the Engine Automatic-Start Procedure (Ref. AMM TASK 71-00-00-710-003) or the Engine Manual-Start Procedure (Ref. AMM TASK 71-00-00-710-004).
2 Make sure that the Green, Yellow and Blue hydraulic systems have a pressure of 3000 psi (207 bar).
(5) Use only one of the pressurization procedures.

NOTE: AIRBUS recommends that you do pressurization with the ground power cart or with the EDPs.
If you pressurize with the electric pumps it is possible that the hydraulic pressure will not be sufficient to do the WTB/POB test successfully (result will be 'TEST INVALID').

(a) Make sure that the hydraulic pressure stays constant during this test. The test will abort if the hydraulic pressure decreases under approximately 2500 psi.

Subtask 27-51-00-860-052-B ** ON A/C NOT FOR ALL

F. Initial Conditions
(1) Make sure that the CFDS is not in the SFCC MENU mode before you start the test. You must go from the off-line mode (SFCC MENU mode) to the on-line mode (SFCC NORMAL mode).

NOTE: The test will not operate if a BITE test was completed before without going from the off-line mode to the on-line mode.
Subsequently a 'CORRUPTED RAM -RETURN ONLINE' or a 'PIN PROG FAULT' will be shown.

NOTE: If you do this WTB/POB test with engine driven pumps and you entered a FLT NBR or a F-PLAN through the MCDU before engine start, CFDS is inhibited 3 min after first engine start.

If this occurs, do the steps that follow:
(a) Open the C/Bs (for designation and location refer to Para. 3.G.):

(b) After 40 seconds, close C/Bs 2TW and 8TW.
(c) Wait for CFDS initialization.
(d) Close C/B 3WW.
(e) Do the operational test of the WTB/POB (refer to Para. 4.A.).
(f) Close C/B 2WW after the test was done successfully.
(4) It is possible to pressurize the hydraulic systems with 3 different procedures:
(a) Pressurization with the electric pumps:
1 Pressurize the Blue hydraulic system with the blue electric pump (Ref. AMM TASK 29-10-00-863-003).
2 Pressurize the Green hydraulic system from the Yellow hydraulic system through the Power Transfer Unit (PTU) with the electric pump (Ref. AMM TASK 29-23-00-863-001).
(b) Pressurization with a ground power cart:
1 Pressurize the Blue hydraulic system with the ground power cart (Ref. AMM TASK 29-10-00-863-003).
2 Pressurize the Yellow hydraulic system from the Green hydraulic system through the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-863-002).
(c) Pressurization with the engine driven pumps (EDPs):
1 Start both engines by the Normal Engine Automatic-Start Procedure (Ref. AMM TASK 71-00-00-710-043) or the Normal Engine Manual-Start Procedure (Ref. AMM TASK 71-00-00-710-047).
2 Make sure that the Green, Yellow and Blue hydraulic systems have a pressure of 3000 psi (207 bar).
(5) Use only one of the pressurization procedures.

(a) Make sure that the hydraulic pressure stays constant during this test. The test will abort if the hydraulic pressure decreases under approximately 2500 psi.

Subtask 27-51-00-860-052-C ** ON A/C NOT FOR ALL

NOTE: If you do this WTB/POB test with engine driven pumps and you entered a FLT NBR or a F-PLAN through the MCDU before engine start, CFDS is inhibited 3 min after first engine start.

If this occurs, do the steps that follow:
(a) Open the C/Bs (for designation and location refer to Para. 3.G.):

(b) After 40 seconds, close C/Bs 2TW and 8TW.
(c) Wait for CFDS initialization.
(d) Close C/B 3WW.
(e) Do the operational test of the WTB/POB (refer to Para. 4.A.).
(f) Close C/B 2WW after the test was done successfully.
(4) It is possible to pressurize the hydraulic systems with 3 different procedures:
(a) Pressurization with the electric pumps:
1 Pressurize the Blue hydraulic system with the blue electric pump (Ref. AMM TASK 29-10-00-863-003).
2 Pressurize the Green hydraulic system from the Yellow hydraulic system through the Power Transfer Unit (PTU) with the electric pump (Ref. AMM TASK 29-23-00-863-001).
(b) Pressurization with a ground power cart:
1 Pressurize the Blue hydraulic system with the ground power cart (Ref. AMM TASK 29-10-00-863-003).
2 Pressurize the Yellow hydraulic system from the Green hydraulic system through the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-863-002).
(c) Pressurization with the engine driven pumps (EDPs):
1 Start both engines by the Normal Automatic-Start Procedure (Ref. AMM TASK 71-00-00-860-823) or the Normal Manual-Start Procedure (Ref. AMM TASK 71-00-00-860-822).
2 Make sure that the Green, Yellow and Blue hydraulic systems have a pressure of 3000 psi (207 bar).
(5) Use only one of the pressurization procedures.

(a) Make sure that the hydraulic pressure stays constant during this test. The test will abort if the hydraulic pressure decreases under approximately 2500 psi.

Subtask 27-51-00-865-119-A

G. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FWS/FWC1/SPLY	3WW	F01
** ON A/C NOT FOR ALL
121VU	CFDS/CFDIU/SPLY	2TW	J18
121VU	CFDS/CFDIU/BACK/UP	8TW	J17
** ON A/C ALL
121VU	EIS/FWC2/SPLY	2WW	Q07
** ON A/C NOT FOR ALL
121VU	CFDS/CFDIU/SPLY	2TW	J41
121VU	CFDS/CFDIU/BACK/UP	8TW	J40

4. Procedure
Subtask 27-51-00-710-052-A

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

CAUTION: IF THE THRUST REVERSER COWLS ARE OPEN, MAKE SURE THAT THE HALF DOORS OF THE THRUST REVERSER ARE CLOSED BEFORE YOU EXTEND THE SLATS. IF THE DOORS ARE OPEN, YOU CAN CAUSE DAMAGE TO THE SLATS AND HALF DOORS WHEN THE SLATS EXTEND.

A. Operational Test of the Wing Tip Brake and the Pressure-Off Brake

NOTE: When you do this test, the slat and flap surfaces will move automatically.

(1) Make sure that all the initial conditions are obeyed.
(2) Do the test that follows:

ACTION	RESULT
1.On the panel 121VU: Open the circuit breakers 7CV and 8CV (flap and slat system 2).
2.Set the slat and flap control lever to position 3.	The slats and flaps move to position 3. Make sure that the lever will stay in this position during the WTB/POB test.
3.On the MCDU: Push the line key < SYSTEM REPORT/TEST.	ON the MCDU: The SYSTEM REPORT/TEST page comes into view.
4.Push the line key F/CTL >.	The SYSTEM REPORT/TEST F/CTL page comes into view.
5.Push the line key < SFCC 1 (2).	The MCDU shows the SFCC 1 (2) menu.
6.Push the NEXT PAGE button.	The MCDU shows the next page of the SFCC 1 (2) menu.
7.Push the line key TEST/RESET FLP >.	The MCDU shows the SFCC 1 (2) FLAP TEST/RESET menu.
8.Push the line key < WTB/POB TEST.	The MCDU shows the SFCC 1 (2) FLAP WTB/POB TEST instructions.
9.Push the line key < CONTINUE.	The MCDU shows the next page of the SFCC 1 (2) FLAP WTB/POB TEST instructions.
10.Push the line key < START TEST.
11.If the line key < START TEST is not shown, do the instructions that the MCDU shows.	The MCDU shows that the FLAP WTB/POB TEST is IN PROGRESS.
	The MCDU shows in less than 2 minutes: SFCC 1 (2) DATE: XXX XX__ UTC: XXXX PERFORMED NO FAULTS RESULT NOT STORED This means the test was successful. If the MCDU shows: PERFORMED UNSUCCESSFULLY or TEST ABORTED Do the related trouble shooting procedure.
12.After the test of flap system 1 (SFCC 1), do the WTB/POB test for flap system 2 (SFCC 2): Push the line key < RETURN frequently until the SYSTEM REPORT/TEST - F/CTL menu is shown.
13.Open circuit breakers 5CV and 6CV (flap and slat system 1).
14.Close circuit breakers 7CV and 8CV (flap and slat system 2).
15.Use SFCC 2 to do this test again.
16.After the test of the flap system 2 (SFCC 2) : Push the line key < RETURN frequently until the CFDS menu page is shown.
17.Close circuit breakers 5CV and 6CV.
18.Set the slat and flap control lever to position 0.	The slats and flaps move to position 0.

5. Close-up
Subtask 27-51-00-865-056-A

A. Close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/26VAC	14CC1	B03
** ON A/C NOT FOR ALL
49VU	AUTO FLT/FAC1/26VAC	14CC1	H09
** ON A/C ALL
121VU	AUTO FLT/FAC2/26VAC	14CC2	M18

Subtask 27-51-00-860-053-A ** ON A/C NOT FOR ALL

B. Aircraft Configuration
(1) Depressurize the hydraulic system which you used:
(a) If you used electric pumps:
1 Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
2 Depressurize the Green hydraulic and the Yellow hydraulic systems (Ref. AMM TASK 29-23-00-864-001).
(b) If you used the ground power cart:
1 Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
2 Depressurize the Green hydraulic and the Yellow hydraulic systems after operation of the PTU (Ref. AMM TASK 29-23-00-864-001).
(c) If you used the engine driven pumps:
1 Stop the operation of the engines
(Ref. AMM TASK 71-00-00-710-028).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 27-51-00-860-053-B ** ON A/C NOT FOR ALL

Do the shutdown procedure which you find in the 'Discontinued Start, Restart and Shutdown Procedures'
(Ref. AMM TASK 71-00-00-710-018).

(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 27-51-00-860-053-C ** ON A/C NOT FOR ALL

Do the shutdown procedure which you find in the 'Discontinue Engine Start'
(Ref. AMM TASK 71-00-00-860-824).

(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 27-51-00-942-051-A

C. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Remove the safety barriers.
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.03.31 23:52:15 UTC